Modbus协议在S7-226PLC与伦茨变频器通信中的应用

摘要

In view of problem of distortion of signal of long-distance transmission when using conventional switch quantity, analogue control method to control frequency converter, the paper put forward a method which adopted Modbus protocol to communicate between S7-226 PLC and lenze frequency converter, introduced its communication debugging procedures in details. The actual application showed that the method can effectively resolve problem of signal in distortion process of long-distance transmission, and PLC can easily control running state of frequency converter and read running information of frequency converter under communication mode, so as to achieve purpose of monitoring of running status.%针对采用常规开关量、模拟量控制变频器的方法存在信号远距离传输失真的问题,提出了一种应用Modbus协议对S7-226 PLC和伦茨变频器进行通信的方法,详细介绍了其通信调试步骤.实际应用表明,该方法不仅有效解决了信号远距离传输过程中的失真问题,而且在通信模式下PLC可以方便地控制变频器的运行和读取变频器的运行信息,达到了监控变频器运行状态的目的.